1. Effect of environmental conditions on the stability of vitamins in feeds;Adams,1972
2. BASF, 2000. Vitamins – One of the Most Important Discoveries of the Century. Documentation DC 0002, Animal Nutrition, 6th edition, BASF Corporation, Mount Olive, NJ, USA.
3. The tocopherol content of food and influencing factors;Bauernfeind;CRC Crit. Rev. Food Sci. Nutr.,1977
4. Vitamin stability in premixes and feeds: a practical approach;Coelho,1991
5. Effect of pelleting on nutritional quality of feed;Gadient,1986